You can use javascripts document.getElementById().style method to alter CSS values. Here’s an example:
Create your div tag:
Now create your javascript function:
function changeCss()
{
document.getElementById("myDiv").style.border = '2px dotted #CCC';
}
Now you can call this javascript function on any given event to alter your CSS tags border. Things like height, width, and a bunch others work as well. For instance create an html button, and onclick call the changeCss() function.
I’m teaching myself “ajax” here is how to create the basic xmlhttprequest object, interact with a server-side scripting language such as php, and display the returned xml to the page (in this case a series of html form text boxes).
Here’s an example of quick script I wrote in PHP and added as a cronjob to backup some mysql databases:
// dump database tables to sql text files //
exec('mysqldump -uroot -pPasswordHere music > /tmp/music.sql');
exec('mysqldump -uroot -pPasswordHere taskfreak > /tmp/taskfreak.sql');
// pack into tarballs //
exec("tar -cf /tmp/music.sql.tar /tmp/music.sql");
exec("tar -cf /tmp/taskfreak.sql.tar /tmp/taskfreak.sql");
// gzip tarballs //
exec("gzip /tmp/music.sql.tar");
exec("gzip /tmp/taskfreak.sql.tar");
To install mod-rewrite in debian type a2enmod rewrite from the shell. You will the be asked to restart apache.
A simple mod-write script that blocks anyone from hotlinking to your images would look like this:
RewriteEngine On
RewriteCond %{HTTP_REFERER} !^http://(.+\.)?mysite\.com/ [NC]
RewriteCond %{HTTP_REFERER} !^$
RewriteRule .*\.(jpe?g|gif|bmp|png)$ /images/nohotlink.jpe [L]
You would either place this in an .htaccess file or if you have root access to the server in /etc/apache2/sites-available and then within the directory you want to protect from hotlinking.
switch ($i)
{
case 0:
echo "i equals 0";
break;
case 1:
echo "i equals 1";
break;
case 2:
echo "i equals 2";
break;
}
Update: I have a few developers at my work that have a java background and they didn’t know that you can actually include a conditional in your case, cause I guess java doesn’t let you. So for case 1 (in this instance) you could actually have it test against a variable outside the switch so it would read:
$var = 2;
switch ($i)
{
case 0:
echo "i equals 0";
break;
case $i == $var:
echo "i equals 1";
break;
case $i== $var:
echo "i equals 2";
break;
}
I forget where I used this code recently, but it is useful, as it makes your switch more dynamic.
This will probably grow as I need tar to do more stuff.
Excluding a directory from your tarball:
tar -cf backup.tar /home –exclude “/home/cpanel”
The find command is used to find files in a Unix/Linux system. The grep command is used to find text within files and output. The xargs utility is used to combine commands together. This is a demonstration of using all three to search for specific text within files recursively through the directory tree.
find . | xargs grep my string -risl
r tells the system to perform the search recursively.
i tells it to ignore cases.
s tells it to suppress error messages.
l lets it know we only want matching filenames.
You can also send the output to a file since sometimes the lists can be very long. Once in the file it can easily be browsed using VIM or you can even grep it again.
find . | xargs grep my string -risl > /mylist.grep
After installing imagemagick you can resize images:
convert -size 125x125 /path/to/image.jpg -resize 125x125 /path/to/image.jpg
Ofcourse you can do this in php by executing the shell command using the exec() function.
Well I’ve put enough time and effort into my server configuration, mysql databases, and my web dev files that it was finally time to start backing up. Now I’m not completely crazy, the server does have a 3ware card in it for mirroring, but in the end its still a server in the closet (its not gay) and something bad could happen. So I spent about 2 hours writing a few backup scripts because I’m too poor for rsync and too lazy for amanda.
All you need is a cheap web host like the one I use (about $5 a month) and some time. Here’s what I did:
Well I’ve been running debian sarge with the 2.4 kernel for a long time and things came to ahead when I was unable to install some pecl and pear packages for some neat stuff I’m doing in PHP. I have a tendency to make drastic decisions. In geekdom upgrading your server to not only a new linux version about the kernel as well in one night is considered drastic…I think. I have lots of important stuff on there too, client files, mysql databases, lots of web content in /var/www and not to mention the countless hours, weeks worth of hours I’ve spent fine tuning it.